And the most infuriating thing about the ios7 update is....

Not being able to toggle through google images. If you want to zoom in you have to click on the image, open it, then back up to go back out and look at the next one. Why???
Why make something so straightforward so difficult and infuriating..!!!?

I have to say my initial thoughts were that my eyes were going to bleed. I've kind of got used to it a bit now and haven't found anything particularly great or bad. But then I mainly use my phone for talking to people and could probably just use one of these....

Also its a bit annoying how it underlines night, tonight, tomorrow in a text. Is it supposed to link to your calender?

Same as phone numbers, it's to allow you to set it in a calendar, as you thought. Although, I can't say I've noticed 'night/tonight/tomorrow', particularly. Not something I use very often, anyway, but occasionally it's handy, otherwise I ignore it, same as lots of things put in to help people; many find them useful, many don't, like me, so I ignore them.
Like all software, really...

Is it for the same reason those bluetooth people screw everything up with each new version of iOS? We are so, so lucky those nice people at apple sort it out in subsequent fixes.....

That's kinda different. The Google website is entirely under Google's control. Not Apples. If it does something different on the iPhone than on other devices then that is because Google has specifically chosen to do that for some reason.

Having said that I've got no idea what you're on about regarding Bluetooth? Always seemed fine to me through various versions. But then I just do basic BT stuff like linking to the car hands-free and doing hotspots.

Also its a bit annoying how it underlines night, tonight, tomorrow in a text. Is it supposed to link to your calender?

Same as phone numbers, it's to allow you to set it in a calendar, as you thought. Although, I can't say I've noticed 'night/tonight/tomorrow', particularly. Not something I use very often, anyway, but occasionally it's handy, otherwise I ignore it, same as lots of things put in to help people; many find them useful, many don't, like me, so I ignore them.
Like all software, really...
Edit; I've just noticed one little thing, I tried flicking this page from right to left, and it just 'bounced', but going from left to right to me to the previous version of the same page, with the reply box still open, still showing the text I'd just posted, which has allowed me to edit this. Not sure what'll happen when I post it, it'll probably do a new post, rather than edit the last one, but it's an interesting feature, if feature it is.

Bluetooth is/was pretty notorious for poor standards and standards compliance, there used to be no end of devices which wouldn't interwork as the standard had been interpreted differently by the vendors....